Le kyste hydatique cervical isolé : une localisation inhabituelle

Case report: Hydatid cyst of bone in the distal femur with untypical presentation treated surgically

“…While it is obvious that a comprehensive approach should be taken, one must also have high suspicion of unfamiliar diagnoses, hydatid osseous is a rare manifestation of Echinococcosis that has an unspecific clinical and radiological picture, cystic echinococcosis mainly prevail in the third world countries in the Middle East, central Asia, western China and around the Mediterranean [5] . The visceral form of the disease is the most common form, and the liver is the most common site for cyst formation where it might occur in any soft tissue organ [2] .whereas osseous tissue infestation is not characteristic due to the special structure of bone and the periosteum, many theories is thought to be explaining osseous invasion starting by mechanical expensive process leading to ischemic osteitis and eventually destruction of bony tissue without an inflammatory process [6] , [7] , while the osseous form incidence is reported to be only 0.5–4 % and rarely in the appendicular skeleton [8] , [9] . As the blood-borne scolex invade bone pericyst formation does not occur, rather aggressive proliferation in the line of least resistance bone canals, thus the normal osseous tissue between trabeculae is slowly destructed and replaced due to the growth of multiple vesicles [10] , [11] .…”